Since I was mentioned....
I personally have no problem with people entering a pre-built MoC, as long as it can fit into the theme. However, I agree somewhat with Seran in that some people will assume that the impact and overall creativity might come across as sub-par. Its all up to the people who vote and how they feel that counts.
Circumstances played a role with my entry also, and getting quality pics of a new MoC before the deadline was not possible.